Lake Tazawa is a caldera lake in the city of Semboku, Akita Prefecture, northern Japan. It is the deepest lake in Japan at 423 metres. The area is a popular vacation area and several hot spring resorts can be found in the hills above the lake. Akita Prefecture's largest ski area, Tazawako Ski Area, overlooks the lake.
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Coordinates 39°43'31.787" N 140°39'44.866" E